In 1877, the Grand Duchy of Saxe-Weimar-Eisenach officially became the Grand Duchy of Saxony (German: Großherzogtum Sachsen), but this name was not often used. The Grand Duchy was abolished in 1918 with the other German monarchies, and the state joined others to form the new state of Thuringia in the Weimar Republic.

↑Carl August was born as the heir apparent to the Grand Duchy, so he was always known as Hereditary Grand Duke Carl August. Prince Michael was born after the Grand Duchy was abolished, and is called Prince Michael as he has never reigned as Grand Duke.